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my application shows help files inside the screen using default pdf reader installed in the machine.
I installed foxit reader version 5.4.5.124. now foxit reader opening .pdf file in a separate window. is there is any solution for this issue? but in some machines it works properly as expected.
in task manager foxit reader shown as 32 bit process. my application is x64 bit process.

Did the help files be opened online from within browsers? If yes, please go to 'Edit'->'Preferences'->'File Associations'->to check if 'Display PDF in Browser' has been selected.
Foxit Reader is complied under 32-bit environment and it is not a native 64-bit application.